Appending mixed types to strings seems a bit tricky. Is this the intended behaviour?

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I understand why I get different results, but is seems wrong. Is this intended?
'1' + "1" + 1
ans = "111"
'1' + 1 + "1"
ans = "501"

Accepted Answer

Rik
Rik on 27 Sep 2022
Edited: Rik on 27 Sep 2022
It helps to do this step by step, which show that (while unintuitive), this is intended behavior.
Matlab evaluates code from left to right:
'1' + "1"
ans = "11"
ans + 1
ans = "111"
And your second example:
'1' + 1
ans = 50
ans + "1"
ans = "501"
Because the first call to plus doesn't know you want to use a string as an operand later, this results in a conversion to double, and since the UTF-16 encoding of '1' is uint16(49), this results in double(50).
You can avoid this by putting in some parentheses:
'1' + ( 1 + "1" )
ans = "111"
  6 Comments
Tomazz
Tomazz on 27 Sep 2022
Sure, it makes sense.
Still, I was a bit surprised that (S1+S2)+S3 is not equal to S1+(S2+S3) in this case.

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